Anionic Fatty Amides Used As A Dispersant For Pigment Preparations

Abstract

The invention relates to aqueous, binder-free pigment preparations containing at least one anionic fatty amide of formula (I), where R is a linear or branched, saturated or unsaturated C 7 to C 17 -aliphatic hydrocarbon group, A is an anionic group, such as a sulphate, phosphate or methyl-carboxylate group or a sulfosuccinic acid half-ester group, and n represents a whole number between 1 and 30.

1 . An aqueous binder-free pigment preparation comprising
 (A) 1.0 to 75.0 wt % of at least one organic or inorganic white or colored pigment or a mixture of various organic and inorganic white or colored pigments,   (B) 0.01 to 8.0 wt % of at least one anionic fatty acid amide of formula (I),   
       
         
           
           
               
               
           
         
         
           where 
           R is a linear or branched, saturated or unsaturated C 7  to C 17  aliphatic hydrocarbyl moiety, 
           A is an anionic group, and 
           n is an integer from 1 to 30, and 
         
         (G) water, 
         wherein the pigment preparation is free from polymers or resins dissolved or dispersed in a suitable solvent and dries physically, chemically, thermally, oxidatively or by radiative curing. 
       
     
     
         2 . The aqueous binder-free pigment preparation as claimed in  claim 1  wherein the anionic fatty acid amide is a sulfuric monoester of formula II, 
       
         
           
           
               
               
           
         
         where 
         R is a linear or branched, saturated or unsaturated C 7  to C 17  aliphatic hydrocarbyl moiety, 
         M is a hydrogen atom, Na, K, ammonium or triethanolammonium ion, and 
         n is an integer from 1 to 30. 
       
     
     
         3 . The aqueous binder-free pigment preparation as claimed in  claim 1  wherein the fatty acid amide is a phosphoric ester of formula III, 
       
         
           
           
               
               
           
         
         where 
         R is a linear or branched, saturated or unsaturated C 7  to C 17  aliphatic hydrocarbyl moiety, 
         Me is a hydrogen atom, Na, K, ammonium or alkanolammonium ion, and 
         n is an integer from 1 to 30. 
       
     
     
         4 . The aqueous binder-free pigment preparation as claimed in  claim 1  wherein the anionic fatty acid amide is an ethercarboxylic acid of formula IV, 
       
         
           
           
               
               
           
         
         where 
         R is a linear or branched, saturated or unsaturated C 7  to C 17  aliphatic hydrocarbyl moiety, 
         Ma is a hydrogen atom, Na, K, ammonium or alkanolammonium ion, and 
         n is an integer from 1 to 30. 
       
     
     
         5 . The aqueous binder-free pigment preparation as claimed in  claim 1  wherein the fatty acid amide is a sulfosuccinic monoester of formula V, 
       
         
           
           
               
               
           
         
         where 
         R is a linear or branched, saturated or unsaturated C 7  to C 17  aliphatic hydrocarbyl moiety, 
         X and Y are sulfonic acid groups in acidic form or as sodium salt or a hydrogen atom subject to the proviso that X is a sulfonic acid group when Y is a hydrogen atom, and conversely, X is a hydrogen atom when Y is a sulfonic acid group, and 
         n is an integer from 1 to 30. 
       
     
     
         6 . The aqueous binder-free pigment preparation as claimed in  claim 1 , further comprising
 (C) 0.01-12.0 of a nonionic surfactant selected from the group consisting of
 fatty alcohol ethoxylates and fatty alcohol alkoxylates, 
 fatty acid ethoxylates, 
 fatty acid esters of polyethylene glycols, 
 fatty acid alkanolamide ethoxylates, 
 sugar surfactants, 
 alkylpolyglycosides, 
 polyhydroxy fatty acid amides, and 
 ethoxylation products of fatty acid sorbitan esters, castor oil, fatty acid glycerol esters and fatty acid polyglycerol esters. 
   
     
     
         7 . The aqueous binder-free pigment preparation as claimed in  claim 3 , comprising from 1 to 7 wt % of a phosphoric ester of formula (III). 
     
     
         8 . The aqueous binder-free pigment preparation as claimed in  claim 1 , comprising from 10 to 75 wt % of water. 
     
     
         9 . The aqueous binder-free pigment preparation as claimed in  claim 1 , which has a viscosity of from 10 to 10 000 mPas, determined with a plate-cone viscometer at a shear rate of 1/60 sec −1 . 
     
     
         10 . The aqueous binder-free pigment preparation as claimed in  claim 1 , further comprising
 (D) 0.01-8.0 wt % of clay mineral thickeners selected from natural or alkali-activated sheet-silicate minerals.   
     
     
         11 . The aqueous binder-free pigment preparation as claimed in  claim 1 , further comprising
 (E) 0.01-20.0 wt % of inorganic fillers.   
     
     
         12 . The aqueous binder-free pigment preparation as claimed in  claim 1 , further comprising
 (F) 0.01 to 30 wt % of further customary auxiliaries for producing an aqueous binder-free pigment preparation which are selected from the group consisting of wetting agents, moisture retainers, solvents, defoamers, rheology additives, preservatives, buffering substances and pH regulators.   
     
     
         13 . The aqueous binder-free pigment preparation as claimed in  claim 12 , comprising up to 15 wt % of the moisture retainer/solvent, wherein the moisture retainer/solvent is selected from the group consisting of glycol ethers of 200 to 20 000 g/mol number average molecular weight. 
     
     
         14 . The aqueous binder-free pigment preparation as claimed in  claim 12 , comprising up to 2 wt % of defoamer. 
     
     
         15 . The aqueous binder-free pigment preparation as claimed in  claim 12 , comprising up to 1 wt % of an in-can preservative. 
     
     
         16 . A for pigmenting a macromolecular material, coating, paint and varnish for printing two-dimensional sheet materials comprising the step of adding an aqueous binder-free pigment preparation as claimed in  claim 1  to the macromolecular material, coating, paint and varnish. 
     
     
         17 . The aqueous binder-free pigment preparation as claimed in  claim 1 , further comprising alkylglucamides,